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English definition of “upstairs”

upstairs

adverb [before noun], adjective uk   /ʌpˈsteəz/ us    /-ˈsterz/
A2 towards or on the highest floor or floors of a building: an upstairs landing/window He heard glass breaking and ran upstairs to see what had caused it.
Opposite
Floors and parts of floors
upstairs
noun [S] uk   us  
Sadly, the upstairs of the house was gutted by fire.Floors and parts of floors
(Definition of upstairs from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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